Identifying Engine Bits

[paddles]

Hey Guys,

I'm currently finishing off an rb25det into 260z conversion and there's a few bits on the motor that I'm unsure of. Would love to know what these bits do and if they are necessary (if they aren't necessary it would be nice to tidy things up a bit!).

Any help would be great!

1) Has coolant lines running into and out of it - located on a sammich plate between block and oil filter.

2) Located on the underside of the inlet manifold, this guy has coolant lines running into and out of it. Also has two wires going into it.

3) These two connectors are connected to... nothing... To the left of the pic the wires have been cut. What did the wires go to and are they necessary? Had a look at a wiring digram to try and sort this one out but it didn't seem to cover everything.

Any help would be very much appreciated!

Cheers

[Ruffels]

2nd pic is one of the idle bypass valves..

3rd pic is a main loom connector plug.. pretty sure theres ignition wires there

[Adriano]

1st one is the oil cooler/heat excanger.

2nd one has air going through it, not coolant.